Zink's Thunder Ridge Series is crafted using state-of-the-art injection molding technology. Zink Calls' new Thunder Ridge Series guarantees you'll find the same quality and consistency not only in every call, but in every note. Whether at 150 yards or 15 feet, these innovative slate calls provides a fantastic range of sound, with one common denominator - it drives gobblers wild! The Thunder Ridge Series includes a two-piece hardwood striker and a Slate specific conditioning pad. It also Sports the popular E-Z Gripper Ring and built-in Striker conditioning pocket. As an added bonus is a copy of Zink's latest DVD production, Turkey Time University Vol. II - Friction Calling Basics.